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Fair Value Measurements - Summary of Differences Between Fair Value and Principal Value (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Mortgage loans held for sale | $ 219,848 | $ 108,316
Aggregate Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Mortgage loans held for sale | 219,848 |
Past due loans of 90 days or more | 0 |
Nonaccrual loans | 0 |
Aggregate Unpaid Principal Balance |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Mortgage loans held for sale | 211,460 |
Past due loans of 90 days or more | 0 |
Nonaccrual loans | 0 |
Difference |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Mortgage loans held for sale | 8,388 |
Past due loans of 90 days or more | 0 |
Nonaccrual loans | $ 0 |

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